Editing Irish initial mutations (section)

==== After the definite article ====
The definite article triggers the lenition of:

# a feminine noun in the nominative singular
#: {{Lang|ga|an '''bh'''ean}} "the woman"
# a masculine noun in the genitive singular
#: {{Lang|ga|an '''fh'''ir}} "of the man" e.g. {{Lang|ga|carr an fhir}}, the man's car (car of the man)
# a noun in the dative singular, when the article follows one of the prepositions {{Lang|ga|de}} "from", {{Lang|ga|do}} "to" or {{Lang|ga|i}} "in"
#: {{Lang|ga|do}} + {{Lang|ga|an}} = {{Lang|ga|don}}: {{Lang|ga|don '''fh'''ear}} "to the man"
#: {{Lang|ga|de}} + {{Lang|ga|an}} = {{Lang|ga|den}}: {{Lang|ga|den '''bh'''ean}} "from the woman"
#: {{Lang|ga|i}} + {{Lang|ga|an}} = {{Lang|ga|sa(n)}}: {{Lang|ga|sa '''ch'''rann}} "in the tree"; {{Lang|ga|san '''fh'''ómhar}} "in the autumn"

[[Lenition#Blocked lenition|Lenition is blocked]] when a [[coronal consonant]] is preceded by {{lang|ga|an}}.

:: {{Lang|ga|an '''d'''eoch}} "the drink", although {{Lang|ga|deoch}} is feminine nominative singular
:: {{Lang|ga|an '''t'''í}} "of the house", although {{Lang|ga|tí}} is masculine genitive singular

Instead of leniting to {{IPA|/h/}}, after the definite article, {{IPA|/sˠ, ʃ/}} become {{IPA|/t̪ˠ, tʲ/}} (written {{vr|ts}}):

:: {{Lang|ga|an '''ts'''úil}} {{IPA|/ən̪ˠ t̪ˠuːlʲ/}} "the eye" (fem. nom. sg.)
:: {{Lang|ga|an '''ts'''aoil}} {{IPA|/ən̪ˠ t̪ˠiːlʲ/}} "of the world" (masc. gen. sg.)